Guide to Tyre Wall Markings

Have you ever wondered what all of the writing on your tyre wall means? Perhaps you know where to spot the load index and size information, but do you know what all of the other symbols mean? Can you find out when your tyre was manufactured, or where?

The markings on tyre walls are mainly there for two reasons; firstly, to indicate the size and specifications of the tyre, and secondly, to prove that the tyre has passed European and other country safety standards.

We make it our business to know everything there is to know about tyres, and we can advise you on every aspect of tyre safety, specification and suitability. We stock a wide range of tyres to suit all budgets, and can supply and fit them for you whether you need replacement tyres locally.

Here, we’ve teamed up with the experts at Michelin to bring you a guide to tyre wall markings.

1. Type of ConstructionNearly all modern tyres are of Radial construction, as in this example.

2. Load IndexA numerical code referring to the maximum load the tyre can carry at the speed indicated by its speed symbol. In this example, the code is 91, therefore the maximum load per tyre is 615kg.

See the table below to find out specific load index details for each code:

Load Index

Kg

Load Index

Kg

Load Index

Kg

65

290

80

450

95

690

66

300

81

462

96

710

67

307

82

475

97

730

68

315

83

487

98

750

69

325

84

500

99

775

70

335

85

515

100

800

71

345

86

530

101

825

72

355

87

545

102

850

73

365

88

560

103

875

74

375

89

580

104

900

75

387

90

600

105

925

76

400

91

615

106

950

77

412

92

630

107

975

78

425

93

650

108

1000

79

437

94

670

3. Speed SymbolA letter which indicates the maximum speed at which the tyre can carry the load corresponding to the Load Capacity Index. In this example, the symbol is V, therefore the maximum speed is 149mph or 240km/h. Common speed symbols in the UK are ‘S’, ‘T’, ‘H’, ‘V’, ‘W’ and ‘Y’

See the table below to find out specific speed ratings for each symbol:

7. Location of Tread Wear Indicators(This marking is not on all tyres.) Tread wear indicators are moulded into the base of the main tread grooves and are set at the minimum legal depth of 1.6mm. These act as a visual warning when the tyre tread starts to approach the minimum legal depth. On Michelin tyres, a small Michelin man is used instead of “TWI”

8. North American Department of Transportation (DOT) MarkingsCompliance symbol and identification number (not required in UK).

9. Manufacturing Date CodeThese numbers represent the week and year the tyre was made. The first two numbers are the week, the second two are the year. In this example, 1607 means the 16th week of 2007.

10. European ECE Type Approval Marks and numbers.This proves that the tyre has been tested and passed European safety standards.‘S’ = Sound (the tyre complies with EC noise directive).

11. Tyre Construction Details

12. Commercial Name and IdentityIn this example, Michelin

13. Max Load/ Pressure Information (Not required in UK.)Not to be used for setting pressures. Use the vehicle manufacturer recommended pressures.

15. Tyre Size DesignationThis indicates the width, height and construction type of the tyre, and the diameter of the wheel it is designed for. In this example, 205/55 R 16 means:

205 - the nominal width of the tyre’s cross-section in millimetres.55 - is the ‘aspect ratio’ - the ratio of the sidewall height to the cross-section width.R - stands for radial construction.16 - stands for the nominal diameter (in inches) of the wheel that the tyre is designed to fit.

If you are in any doubt about the markings on your tyres, or would like advice on anything related to tyres, you can get in touch with one of our experts by calling the telephone number displayed at the top of this page.

Other services offered by Geoffrey Harris Tyres Ltd:

Google Reviews for Geoffrey Harris Tyres Ltd

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a month ago

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